The Avett Brothers band postponed its sold-out show at the McMenamins Edgefield in Troutdale on Saturday night after a man showed up at the concert with a gun, then disappeared into the crowd.

On its website, the band said the man triggered a metal detector when entering the venue.

"When confronted by the security guard and informed of the no-firearm policy of the venue, the individual stated that he was an out-of-state police officer and showed a badge," the band wrote.

Before security could confirm his story, though, the band said, the man walked into the crowd.

"Due to the obvious threat posed by someone in the audience with a firearm, regardless of his (unconfirmed) claim of being a member of law enforcement, we were obligated, for the safety of everyone present, to cancel the performance," the band wrote.

A representative of the Edgefield hotel initially said Saturday that sound problems prompted the cancellation. Jimi Biron, who handles bookings for McMenamins, later said that was incorrect.

The Multnomah County Sheriff's Office initially said Saturday that a sergeant stationed at the Edgefield on Saturday heard nothing about a potential threat. Early Sunday, though, the office said its staff had in fact assisted in the unsuccessful search at the venue for the man with the gun.

A spokeswoman for McMenamins and the show's producers said the incident did not warrant evacuation or endanger the audience.

"The security of our patrons is of utmost importance. We regret the inconvenience but feel the proper decision was made to postpone the show," spokeswoman Vicky Hastings said.

The sheriff's office said Sunday it has no credible information of a threat to the public and so has not opened a criminal investigation into the incident.

The Avett Brothers is a popular roots-rock band originally from North Carolina. Their best-known songs include "Head Full of Doubt / Road Full of Promise," "Ain't No Man" and "Kick Drum Heart."

Saturday's show was the third of three the Avett Brothers had been scheduled to perform at the Edgefield this week.

McMenamins is working to reschedule the show, Biron said, but fans who would prefer a refund can contact support@etix.com. He said the Avett Brothers offered to go on Sunday night instead but the Edgefield already has Steve Martin and Martin Short booked to perform.

Concertgoers on social media were initially outraged that the band canceled without an immediate explanation. After the band reported the gun issue, though, fans were more forgiving.

Elizabeth Falcone, from North Portland, said it made sense to cancel the show and to be discreet about the reason why given the potential threat. She regretted missing Saturday's show but said she hopes to see the rescheduled performance.

"They did exactly the right thing...if they thought somebody was in there with a gun," Falcone said. "I would absolutely go back and see them because I feel like they did what they're supposed to do. That's what security screening is for."

This article has been updated to note that McMenamins, which initially said a sound issue was responsible for the cancellation, now says that is not the case. Another update indicates that the sheriff's office, which initially said it knew nothing of a potential threat at the concert, now says it was involved in the search for the man with the weapon. An update Sunday added a response from a company representing McMenamins and the producers of the show.